Light Emitting Transfer Circuit With Low-Pass Reference Filtering
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Solution Overview
Problem
Existing light emitting devices with transfer units suffer from waveform deterioration due to capacitance, necessitating a switch mechanism to disconnect the reference potential terminal, which complicates the circuit.
Innovation Solution
Incorporating a low-pass filter between the reference potential terminal of the transfer unit and the external reference potential to reduce waveform deterioration without switching the connection state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the reference potential terminal of the transfer unit is directly connected to a reference potential, then charges can be discharged from the transfer unit, but the waveform of current flowing in the light emitting element deteriorates due to the capacitance of the transfer unit
Solution Approach 1:
A low-pass filter is introduced as an intermediary component between the reference potential terminal and the external reference potential. This filter allows DC charge discharge while blocking high-frequency noise that would otherwise deteriorate the current waveform in the light emitting element.
Solution Approach 2:
The impedance characteristics of the connection path are changed by introducing the low-pass filter, which has high impedance at high frequencies and low impedance at DC. This parameter change enables selective passage of DC signals while blocking AC noise, resolving the contradiction between charge discharge and waveform quality.
2Manufacturing precision
If a switch mechanism is provided to disconnect the reference potential terminal during light emission, then waveform deterioration can be reduced, but the device complexity increases
Solution Approach 1:
Instead of using a switch mechanism, a low-pass filter serves as a passive intermediary that automatically provides the desired waveform protection without requiring active control or additional switching components, thereby avoiding increased device complexity.
Solution Approach 2:
The low-pass filter automatically performs the waveform protection function based on its inherent frequency-selective characteristics, without requiring external control signals or switching operations. The filter self-regulates the signal transmission based on frequency content.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Stabilizes the reference potential and reduces waveform deterioration by using a low-pass filter, simplifying the circuit and maintaining stable transfer operations.
Implementation Method 1
a low-pass filter provided between a reference potential terminal of the transfer unit and an external reference potential
Data Source
AI summary
A light emitting device includes: a light emitting unit that includes plural light emitting elements; a transfer unit that transfers a signal for setting a light emitting element to turn into an on state among the plural light emitting elements; and a low-pass filter provided between a reference potential terminal of the transfer unit and an external reference potential.